Activists gathered peacefully to push for peace and immigrants’ rights during the day, while two groups of demonstrators — one showing support for President Donald Trump and another against him — briefly clashed in the evening at Seattle's Westlake Park downtown.

Police issued a dispersal order, which is a notice to a particular group to clear an area to “prevent or control a serious disorder, and promote the safety of persons or property,” according to the Seattle Police Department manual.

Minutes later, Westlake Park was mostly cleared. Officers were seen holding their bicycles to push demonstrators from the area.

A Seattle Times staff member reported being shoved.

After increasing tensions and several fights in Westlake Park this evening, officers are issuing a dispersal order to the crowd. pic.twitter.com/oxEgVcfwtE

Meanwhile, a crowd roughly 2 miles away outside the King County Juvenile Detention Center has shrunk.

Many have drifted away from the “pop-up bloc party,” though a group of roughly 100 people danced and sang along with local rap artists, who passed the microphone outside the south wall of the Youth Services Center

One singer jumped on top of a Chevy Suburban, turning the vehicle into a stage. A generator set up in the bed of a pickup provided power for the speakers and DJ equipment.

“I love a peaceful demonstration, don’t you?” one man proclaimed and was answered with cheers.

The characters: two groups of activists with opposing political stances.

The solution, at least for now? Weed … and Kendall Jenner.

Demonstrators from opposite groups — one in support of Trump and the other against him — shared a “peace joint” and some laughs mocking the controversial Pepsi ad that showed the Kardashian sister stepping away from a modeling shoot to join a crowd of smiling, young protesters.

Here’s a video recap of what’s happened so far at Westlake Park, where dozens of Trump supporters have gathered for a rally:

Dozens of pro-Trump demonstrators marched through Seattle on May Day, ending by sharing marijuana, hugs and Pepsi back in Westlake Park. Note: Video contains strong language. (Seattle Times Staff)

Meanwhile, an impromptu block party is under way outside the King County Juvenile Detention Center.

The “pop-up bloc party” is being staged by a group of music-management and artist-collective organizations to protest the incarceration of marginalized youth and migrants.

Rap artist Bypolar, one of the main organizers of the event, said they have not secured permits from the city but will have lawyers and police liaisons on site to “have a conversation” with any police or city officials who potentially try to shut down the event.

Bypolar, a 31-year-old Seattle native, describes himself as an artist and community organizer who opposes construction of a new juvenile detention center — and incarceration of marginalized people. He and other members of High Gods Entertainment, “an art collective for radical change,” set up music equipment outside the south wall of the King County Youth Services Center in hopes that juveniles inside would hear the music and feel supported.

Young people gathered around a smoking charcoal barbecue as hip-hop and street music filled East Spruce Street.

“We’re not for prisons at all. We need to invest that money into our communities,” thereby addressing the underlying causes of crime, Bypolar said. “I’m saying there are other avenues. Prisons aren’t the answer.”

Rap artist Bypolar, one of the main organizers of a “pop-up bloc party” outside the King County Juvenile Detention Center, discusses his event protesting the incarceration of marginalized youth and migrants. (Erika Schultz / The Seattle Times)

Update, 5:18 p.m.

Tension among groups of protesters is rising at Westlake.

With shouts, people against Trump are clashing with those who support him.

Meanwhile, protesters in Portland have destroyed a police car, damaged numerous windows and property, started fires in the streets and attacked police, the Associated Press reports. Police have arrested three people.

If you do not need to come to Downtown Portland, please stay away. #MayDayPDX is now considered a riot.

Meanwhile, a group is protesting on Amazon’s campus in Seattle’s South Lake Union neighborhood.

According to a Facebook page for that event, the group has a list of several “demands” for the tech corporation and its CEO, Jeff Bezos, including “free community college for everyone in King County” and funding “so that everyone in the region has free transportation.”

He named a particular group — The Proud Boys — as having been actively recruiting in the Northwest and calling for a rally. The group describes itself on a Facebook page as “pro-Western fraternal organization” for men who “refuse to apologize for creating the modern world.”

Members of The Proud Boys may gather at Westlake Park in downtown Seattle Monday afternoon, Fowler said.

“They give speeches and those types of things, so we’ll shift our attention over to there in the next couple of hours,” he said.

Captain Chris Fowler of the Seattle Police Department answers questions from the media about police staffing and what to expect throughout the day. (Mike Carter / The Seattle Times)

Police are prepared in case different crowds of protesters clash Monday, Fowler said.

“Years past, we’ve seen violence of property damage against the businesses, last couple years it’s been against the police,” he said. “This year, I think it’s really much more a crowd-on-crowd threat, certainly we’ve seen that nationally.”

Fowler added:

“Taking that into consideration with our staffing and our tactics — I think we’re prepared to be able to deal with that if it happens.”

Last month, Sawant proposed a resolution to the City Council affirming the right of city employees to request unpaid leave to attend May Day activities, without retaliation. The council passed the proposal unanimously.

Kayla Weiner, 74, a retired clinical psychologist, was among those in the crowd. She said she protested during the civil-rights movement, as well as during the Vietnam War, and today’s activism shows a similar embrace of the intersectionality of different human rights issues.

“People are coming to realize that we have to work together,” she said.

Dr Kaya Weiner: "The new 'in' word is inersectionality. Some of us have been saying that (issues are connected) for 50 years." pic.twitter.com/E6RbHKk5eC

Seattle is one of many U.S. cities where immigrants and their allies, as well as labor rights advocates, are rallying and marching for May Day.

Here’s a breakdown of how people have marked the holiday in Seattle and elsewhere in years past.

Today, events are again planned in places spanning the country, from New York to Los Angeles. Demonstrations are also expected in dozens of smaller cities, such as Ft. Lauderdale, Florida and Portland.

Much of the action is expected in the afternoon and evening.

The White House had no immediate response to the May Day demonstrations.

At St. Mark’s Cathedral on Capitol Hill, roughly 200 people from several congregations gathered to announce the relaunch of the “sanctuary” movement, offering help and protection to immigrants threatened by deportation.

The original sanctuary movement began in the 1980s as churches provided refuge to immigrants fleeing civil wars in Central America. It was revitalized amid stepped up immigration raids at the tail end of the George W. Bush administration.

Now, amid President Donald Trump’s promises to crack down on illegal immigration, faith communities again see the need to step in.

“We declare that should the opportunity arise, we are prepared to provide sanctuary to an immigrant and their family, providing them with a means to continue to resist their deportation while hosted in a safe space for their body and spirit, the ability to remain with their family and community, and a public platform to proclaim their prophetic message regarding just and humane immigration policy,” said Unitarian Universalist minister the Rev. Beth Chronister in a statement.

Congregations throughout the area have been planning how to do this for months, and in some cases are gearing up to house immigrants, as well as offering other assistance, such as legal services. Churches, synagogues and mosques are taking part, according to Michael Ramos, executive director of the Church Council of Greater Seattle, who organized the Monday gathering.

Update, 9:55 a.m.

Several dozen activists are marching downtown as part of the veterans anti-war event.

A group of music-management and artist-collective organizations reportedly plan to host an impromptu block party at an so-far undisclosed location Monday afternoon as part of the May Day events and to protest the incarceration of marginalized youth and migrants.

Using the hashtag #BlocTheJuvie, the groups will announce the location of the event about 3:30 p.m., according to a news release from the group. The “pop-up bloc party” will include hip-hop performances, food, live-painting and speakers, the release reads.

Rap artist Bypolar, one of the main organizers of the event, said they have not secured permits from the city but will have lawyers and police liaisons on site to “have a conversation” with any police or city officials who potentially try to shut down the event.

“A permit is not required to practice your freedom of speech,” Bypolar said in a phone interview. “We’re not doing anything that is particularly special.

“We do not believe in the validation of the state. They’re the problem in the first place.”

Bypolar said protesting youth incarceration has a direct connection to the larger May Day theme of labor struggle.

“Once people get into the (criminal justice) system, it’s so hard to get out,” he said.

According to the news release, High Godz Entertainment, Ending the Prison Industrial Complex and the Northwest Detention Center Resistance are among the main organizations and artist collectives hosting the event.

“Youth and children are target by the police to be derailed into the prison system of means of becoming an unrecognized exploited prison labor workforce,” the release reads.

“As a community we demand alternatives to incarceration that are centered in the experiences of the most marginalized youth, migrants, and artists,” it adds.

Update, 7:55 a.m.:

Thousands are expected to join May Day marches and rallies throughout the day.

Seattle police and transportation officials began warning commuters and pedestrians of expected traffic delays on Friday.

“If you have a bus route that travels through and into the downtown Seattle area, it’s really important for you to start planning ahead now,” Metro spokesman Jeff Switzer said in a Facebook Live video.

Here’s a list of possible affected transit routes, according to King County Metro: